How many IANA time zones are there?

The exact number changes when governments alter their DST rules or create new zones. The IANA collection is updated several times a year to reflect those changes.

Why are there more IANA zones than time zones on a map?

Because the IANA repository tracks every location that has a unique time zone history. A country may have one civil time but three IANA zones if different regions adopted DST in different years. The map shows the present. The collection shows the present and the past.

Do all zones in the collection have people living in them?

No. Some zones exist for uninhabited territories, research stations, or historical reasons. Antarctica has several zones used by different national research bases. Pacific/Midway exists even though Midway Atoll has no permanent population.

How often does the IANA collection change?

Multiple times per year. Governments change DST rules, abolish DST, or shift their standard offset. The directory updates automatically when a new release is published.

Can I use this directory to find my own time zone?

Yes. Search for your nearest major city or your country name. If you are in a small town, search for the nearest listed city in the same time zone. The zone for New York covers all of US Eastern Time, not just the city itself.

What if my location is not in the directory?

Check whether a government change has been announced recently. The IANA project accepts submissions when a country or territory alters its time zone rules. The directory reflects the latest IANA release.

Every Time Zone, Live

How Many Time Zones Actually Exist?

Twenty-four is the classroom answer. The real answer, the one that matters for scheduling a call or catching a flight, lives in the IANA time zone repository. It holds entries for every location that has ever kept its own clock rules. Each one appears in the list below with its live current time, updating as you watch.

Every row gives you three pieces of information: the zone name, the current local time, and the current UTC offset. The offset shown is what is in effect right now. When daylight saving starts or stops, the number changes. You see the live offset, not the standard one.

You can search by city name, country, or zone abbreviation. Type "Tokyo", "Brazil", or "EST". You can sort by UTC offset to see which zones run ahead of yours and which lag behind. Click any zone name to open its dedicated page with the full DST history and annual clock-change dates.

What Do the Zone Names in a Full Time Zone List Mean?

IANA zone names follow a fixed pattern: Area/City.

The Area is a continent or ocean region. The City is a major population centre whose clock-change history stands in for the whole region. That history is the point. The name does not just encode the current offset. It encodes every DST rule change, every abolition, every oddball one-year experiment the location has ever seen.

The repository holds entries for every such location. A classroom map stops at 24 because it only cares about the present. The IANA collection cares about the past too. Australia alone uses three standard offsets, and DST applies in some states but not others. Canada runs six time zones. France, counting its overseas territories, spans 12.

Why Does a Full Time Zone Directory Show the Current Offset, Not the Standard One?

A zone has two offsets worth knowing. The standard offset is what it uses outside DST. The current offset is what it uses today. They are often different.

America/New_York has a standard offset of UTC-5. From the second Sunday in March to the first Sunday in November, it shifts to UTC-4. The directory shows the live offset. You never have to calculate whether DST is active.

This matters for scheduling. A meeting set for 3pm Eastern Time in January runs on UTC-5. The same meeting in July runs on UTC-4. Rely on the standard offset all year and you will be an hour off for half of it.

Which Zones Share the Same UTC Offset?

You do not have to scroll the full list. Filters narrow it down.

Filter by region: Americas, Europe, Asia, Africa, Australia, Pacific, Atlantic, Indian Ocean, Antarctica. Filter by UTC offset, from UTC-12 to UTC+14, in 15-minute increments.

If you only need zones that match your own offset, filter to that number. Planning a trip to Europe? Filter by Europe to see every zone in that region at once.

What Is on Each Zone's Dedicated Page?

Every zone name in the directory is a link. Click it to open a page for that zone alone. That page shows the full DST transition schedule for the next 10 years, the complete history of offset changes since the repository began, and a list of major cities that use that zone. It also shows the current time in a large display.

Use these pages when you need to know not just what time it is now, but when the clocks will change next, or whether a specific date in the past fell in DST or standard time.